Molybdenum Effect on Photosynthetic Carbon and Nitrogen Metabolism of Brassica napus at Bolting Stage

doi:10.7668/hbnxb.2016.04.035

Abstract

Abstract: To investigate the effects of molybdenum (Mo) application on Mo absorption and carbon and nitrogen metabolism of Brassica napus at stem elongation stage,a pot experiment was conducted and the tissue Mo concentration,leaf photosynthetic parameter,leaf pigment,soluble sugar,free amino acid,and soluble protein were tested.The results showed that the fresh weight of two cultivars (L0917 and ZS11) were increased 235.50% and 67.94% with Mo application.The pigments under Mo application showed significant differences for ZS11.The Chl a/b decreased 16.28% and 10.26% for L0917 and ZS11,respectively.Mo application increased chlorophyll and transpiration rate (Tr) and decreased Chl a/b and intercellular CO₂ concentration (Ci).The net photosynthesis rate (Pn) and stomatal conductance (Gs) had no significant difference whether provided Mo or not.The solution sugars,free amino acids and soluble proteins increased by 35.31%,83.57%,and 16.81% for L0917 and 91.38%,274.30%,and 16.02% for ZS11,respectively.The nitrate reductase activities were also increased by 211.50% and 335.80% for L0917 and ZS11 cultivar.In addition the Mo concentrations of roots,stalks and leaves were also increased.Overall,our study presents necessity and usefulness of stem elongation stage for reproductive and vegetative growth of flowering and harvest stage.

Key words: Molybdenum, Brassica napus, Bolting stage, Carbon metabolism, Nitrogen metabolism

CLC Number:

S143

QIN Shiyu, SUN Xuecheng, HU Chengxiao, TAN Qiling, ZHAO Xiaohu, LI Lu. Molybdenum Effect on Photosynthetic Carbon and Nitrogen Metabolism of Brassica napus at Bolting Stage[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2016, 31(4): 227-232. doi: 10.7668/hbnxb.2016.04.035.

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